Can anyone tell me about ignition timing on indmar monsoon?

So i got my new engine installed in my 1997 sunsetter and got it running. Installed the distributor for initial start up like you would on any vehicle. Boat sounds good at idle. I checked the timing at idle, its right at 0 degree.

So now my problem is disabling the advance to set it to 10 degree btdc. I have been told about possibly jumping two wires? do you back probe a connector and jump them? or completely remove a plug in at the distributor and jump just the terminals?